Ferrari fans will hold a silent 45th birthday tribute to Michael Schumacher today outside the French hospital where the Formula One world champion is in a coma after a skiing accident.

The F1 team's Facebook page said the Scuderia Ferrari Clubs wanted to show their support and were organising "a silent and respectful event all in red" at the Grenoble hospital where the German has been since his fall on Sunday.

Ferrari said the team also planned to put up a special tribute to their former driver, who won five successive titles with them, on the company's website.

Schumacher left Ferrari in 2006 but came out of retirement in 2010 for a three-year comeback with Mercedes that ended in 2012.

His agent Sabine Kehm said on Wednesday that he was in a stable condition and it was too early to talk about his further prospects. No further update was given on Thursday, the day before his birthday.